Compare grocery list with leaflet

Hi all!

I used to do some java programing a few years ago. Now I'd like to write a small program that searches for a list of words (my grocery list) in a text file (the supermarket flyer available in text format). I hope someone can help me with the structure/syntax. Here's what I got so far...

import ??
public static etc.
Create a table called "grocery" with a line for every word in the list of goods
for(int i=0; i<n; i++) grocery[i] = ReadLine(); // Where do I specify that the file is grocery.txt?


String flyerLine = Readline(); // Where do I specify that the file is flyer.txt?
String[]flyerWords = flyerLine.split(" "); //split the string into words
for(int i=0; i<n; i++) { //for each word in the grocery table
for(int j=0; i<m; j++) //search every word in the leaflet table
if(grocery[i] == flyerWords[j]) output[k] = flyerWords[j]; k++; //compare & copy to a table
}
output > output.txt

Okay I know this is really basic, but it's been so long since I haven't written a program. Please help me!

Thanks

Quote:

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Where do I specify that the file is grocery.txt?

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You need some kind of reader. I prefer BufferedReaders myself, an example:

Code:

---

try {
            BufferedReader in = new BufferedReader(new FileReader(new File("myfile.txt")));
            String line;
            while((line = in.readLine()) != null){
                //do something with the line
            }
        } catch (IOException ex) {
            Logger.getLogger(Misc.class.getName()).log(Level.SEVERE, null, ex);
        }

---

This example reads until the end of the file, then the while loop breaks. Hope this helps!

Thanks Quad64bit, this was helpful but I got 7 errors.
Below is an updated version of my code. The errors are of the type "cannot find symbol":
1. symbol : variable Level
2. symbol : class Misc
3. symbol : variable Logger
4. symbol : variable in
5. symbol : variable Level
6. symbol : class Misc
7. symbol : variable Logger

Any help will be appreciated! This is not a student homework btw, I'm a grad student in life sciences trying to make ends meet with grocery rebates...

The program :

Code:

---

import java.io.*;
import java.io.BufferedReader;
import java.io.InputStreamReader;
public class epicerie
{
        public static void main(String[] args)
        {
                String[]listeTab;
                listeTab = new String[320]; 
       
                String[]resultTab;
                resultTab = new String[320];

                try {
                            BufferedReader in = new BufferedReader(new FileReader(new File("liste.txt")));
                            String line;
                            while((line = in.readLine()) != null)
                        {
                                int i = 0;
                                listeTab[i] = line;
                                i++;
                            }
                        } catch (IOException ex) {Logger.getLogger(Misc.class.getName()).log(Level.SEVERE, null, ex);}

                try {
                            BufferedReader in2 = new BufferedReader(new FileReader(new File("iga.txt")));
                            String line2;
                            while((line2 = in.readLine()) != null)
                        {
                                String[]lineWords = line2.split(" ");
                                for(int j = 0; j < lineWords.length; j++ )
                                        {
                                                for(int k=0; k<320; k++)
                                                        {        String str1 = listeTab[k];
                                                                String str2 = lineWords[j];
                                                                int l = 0;
                                                                if(str1.equals(str2))
                                                                {resultTab[l] = str1; l++;}
                                                        }
                                        }

                            }
                        } catch (IOException ex) {Logger.getLogger(Misc.class.getName()).log(Level.SEVERE, null, ex);}

                try
                {
                            FileWriter fstream = new FileWriter("out.txt");
                                BufferedWriter out = new BufferedWriter(fstream);
                            for(int m=0; m<resultTab.length; m++)
                                {
                                        out.write(resultTab[m]+'\n');m++;
                                    }
                            out.close();//Close the output stream
                    }
                catch (Exception e)
                {
                              System.err.println("Error: " + e.getMessage()); //Catch exception if any
                }
               

          }
}

---

Moderator Edit: Code tags added

One of your problems and the source of several of your error messages is that you're copying his code blindly and without thinking which you should never do. Don't use his variable names and all, but instead borrow the concepts and use your own variables and references.

Also, I edited your code and added code tags which should help make your posted code retain its formatting and be more readable.

To do this yourself, highlight your pasted code (please be sure that it is already formatted when you paste it into the forum; the code tags don't magically format unformatted code) and then press the code button, and your code will have tags.

Another way to do this is to manually place the tags into your code by placing the tag [cod&#101;] above your pasted code and the tag [/cod&#101;] below your pasted code like so:

Code:

---

[code]
  // your code goes here
  // notice how the top and bottom tags are different
[/code]

---

Quote:

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Originally Posted by FunkyProg

1. symbol : variable Level
3. symbol : variable Logger
5. symbol : variable Level
7. symbol : variable Logger

---

You are missing the logging import. Figure out how can you import it.

Quote:

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Originally Posted by FunkyProg

2. symbol : class Misc
6. symbol : class Misc

---

Where is the Misc class? Import it if it's in some another package.

Quote:

---

Originally Posted by FunkyProg

4. symbol : variable in

---

See carefully, you are declaring some another variable name for reader and trying to read it using some another variable [in].

Plus, from next time onwards, use Code Tags while posting your code.

Hope that helps,

Goldest

Quote:

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Originally Posted by goldest

You are missing the logging import. Figure out how can you import it.

---

Based on his original post, I don't think that his original intent was to log errors but rather just to write information to a file. Instead I think he ran into trouble when he copy and pasted quad's code that had useful information on using a BufferedWriter but was also using logging of error messages. Having said this, he probably needs to look into and learn to use logging at some point.

To the OP, my forum compatriots make good points. Also wanted to add, you can use a PrintWriter for writing a file out, its a bit easier to work with than the BufferedReader, requiring only a String representing the file name:

Code:

---

try {
            PrintWriter out = new PrintWriter("myOutFile.txt");
            out.println("I wrote this to a file with a PrintWriter!");
            out.close();
        } catch (FileNotFoundException ex) {
            Logger.getLogger(Sorts.class.getName()).log(Level.SEVERE, null, ex);
        }

---

As others have said, don't blind copy this, play with it on its own, understand it, then implement it in your code. I also forgot to mention in my previous post, you should always close the reader or writer when you're done with it (like I did here). You should close when all of your reads are complete or all of your writes are complete. If you don't close a file you are writing, the file often ends up incomplete.